通常我自己处理我的错误，但这次我需要专家的帮助！这从来没有发生在我身上，一个人拥有的数据越少（通常）你能说出发生的事情就越少。
我正在尝试编写一个简单的查询分析器。我随机收到这些类型的崩溃：
1）我从以下功能开始：
Dim thd As New Thread(AddressOf StartSub)
thd.Start()
然后 Startsub 如下：
Public Sub StartSub()
CheckForIllegalCrossThreadCalls = False
txtExecution.Text = "Executing query..."
Dim query As String = QueryBuilder()
UpdateView(query)
End Sub
然后 updateview 更新我拥有的数据网格：
Dim da As New SqlCeDataAdapter(query, connStr)
Dim dt As New DataTable()
Try
da.Fill(dt)
txtExecution.Text = "Query executed successfully."
dgTickets.DataSource = dt
Catch ex As Exception
txtExecution.Text = "Query failed."
tbGrid.BeginInvoke(Sub() tbGrid.SelectedTab = tbGrid.TabPages(1))
End Try
2) UpdateQuery 中的代码在以下行崩溃（调试器并没有说它在这里崩溃，我通过选择所有行并逐个检查它来猜测它）：
dgTickets.DataSource = dt
3) 调试器所说的： NullReferenceException 未处理(...) 使用 new 关键字创建对象实例
堆栈跟踪：
at System.Windows.Forms.DataGridViewCell.GetEditedFormattedValue(Object value, Int32 rowIndex, DataGridViewCellStyle& dataGridViewCellStyle, DataGridViewDataErrorContexts context)
at System.Windows.Forms.DataGridViewCell.PaintWork(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, Int32 rowIndex, DataGridViewElementStates cellState, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
at System.Windows.Forms.DataGridViewRow.PaintCells(Graphics graphics, Rectangle clipBounds, Rectangle rowBounds, Int32 rowIndex, DataGridViewElementStates rowState, Boolean isFirstDisplayedRow, Boolean isLastVisibleRow, DataGridViewPaintParts paintParts)
at System.Windows.Forms.DataGridViewRow.Paint(Graphics graphics, Rectangle clipBounds, Rectangle rowBounds, Int32 rowIndex, DataGridViewElementStates rowState, Boolean isFirstDisplayedRow, Boolean isLastVisibleRow)
at System.Windows.Forms.DataGridView.PaintRows(Graphics g, Rectangle boundingRect, Rectangle clipRect, Boolean singleHorizontalBorderAdded)
at System.Windows.Forms.DataGridView.PaintGrid(Graphics g, Rectangle gridBounds, Rectangle clipRect, Boolean singleVerticalBorderAdded, Boolean singleHorizontalBorderAdded)
at System.Windows.Forms.DataGridView.OnPaint(PaintEventArgs e)
at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.DataGridView.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationContext context)
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
at SQLquery.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
这实际上是很模糊的。上面指定的文件不存在。它崩溃的地方是用 Try-End Try 包裹的。此外，是的，我已经设置了绘画活动，但它不应该涉及它（或者它可能涉及？）。
就这一点而言，我将非常感谢任何提示。我必须补充一点，我使用的是 Visual Basic Express Edition。该错误偶尔会发生 - 有时当我很幸运时什么都没有发生，而当我没有发生时，我会遇到这个崩溃。
皮特。